IOWA ACADEMY OF SCIENCES. 
207 
Panicum L. 
41. P. scribnerianum Nash. ( Panicum panciflorum A. 
Gray.) Dry prairies and knolls; common. 
42. P. dichotomum L. Dry knolls; a hirsute form; in- 
frequent. 
48. P. depauperatum Muhl. Dry ground, woods and 
prairies; rare. 
44. P. virgatum L. Very common. 
45. P. capillare L. Very common, as well as useless. 
Cbletochloa. Scribner. Fox-tail grass. 
46. C. glauca (L.) Scribner. ( Ixophorus glaucus (L.) 
Nash! Setaria glauca Beauv.) A very trouble- 
some w^eed, introduced in cultivated fields. 
47. C. viridis (L.) Scribner. ( Ixophorus viridis (L.) 
Nash. Setaria viridis Beauv.) Introduced like 
the preceding, but less common. 
Zizania L. Wild Rice. 
48. i?. aquatica L. Common in marshes. The seeds of 
this annual grass during very dry seasons will lie 
dormant, only germinating when the proper 
conditions of moisture exist. 
Homalocenchrus Mi eg. 
49. H. virginicus (Willd.) Britton. ( Leerzia virginica 
Willd.) Low places in woods; common. 
50. PL. oryzoides (L.) Poll. ( Leerzia oryzoides Sav.) 
Common in marshes, and along streams. 
Phalaris L. 
51. P. arundinacea L. Rare, near Armstrong. 
Savastana Schrank. Sweet vernal Grass. 
52. S. odorota (L.) Scribner. ( Hierochloa borealis R. and 
S.) Our earliest flowering grass; common in low 
ground, and quite difficult to subdue. 
Stipa L. 
58. S. spartea Trin. Porcupine Grass. Common in high 
prairies. 
Oryzopsis Michx. 
54. 0. melanocarpa Muhl. Frequent in woods. 
